US7231145B2 - Processing of optical performance data in an optical wavelength division multiplexed communication system - Google Patents

Processing of optical performance data in an optical wavelength division multiplexed communication system Download PDF

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Publication number
US7231145B2
US7231145B2 US09/897,948 US89794801A US7231145B2 US 7231145 B2 US7231145 B2 US 7231145B2 US 89794801 A US89794801 A US 89794801A US 7231145 B2 US7231145 B2 US 7231145B2
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power
nodes
node
region
power measurement
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US09/897,948
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US20020101631A1 (en
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Ornan A. Gerstel
Glen P. Koste
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Coriant Operations Inc
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Tellabs Operations Inc
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Assigned to TELLABS OPERATIONS, INC. reassignment TELLABS OPERATIONS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GERSTEL, ORNAN A., KOSTE, GLEN P.
Priority to CA2435678A priority patent/CA2435678C/fr
Priority to PCT/US2002/002117 priority patent/WO2002060095A2/fr
Publication of US20020101631A1 publication Critical patent/US20020101631A1/en
Priority to US11/747,636 priority patent/US7865078B2/en
Publication of US7231145B2 publication Critical patent/US7231145B2/en
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Assigned to CERBERUS BUSINESS FINANCE, LLC, AS COLLATERAL AGENT reassignment CERBERUS BUSINESS FINANCE, LLC, AS COLLATERAL AGENT SECURITY AGREEMENT Assignors: TELLABS OPERATIONS, INC., TELLABS RESTON, LLC (FORMERLY KNOWN AS TELLABS RESTON, INC.), WICHORUS, LLC (FORMERLY KNOWN AS WICHORUS, INC.)
Assigned to TELECOM HOLDING PARENT LLC reassignment TELECOM HOLDING PARENT LLC ASSIGNMENT FOR SECURITY - - PATENTS Assignors: CORIANT OPERATIONS, INC., TELLABS RESTON, LLC (FORMERLY KNOWN AS TELLABS RESTON, INC.), WICHORUS, LLC (FORMERLY KNOWN AS WICHORUS, INC.)
Assigned to TELECOM HOLDING PARENT LLC reassignment TELECOM HOLDING PARENT LLC CORRECTIVE ASSIGNMENT TO CORRECT THE REMOVE APPLICATION NUMBER 10/075,623 PREVIOUSLY RECORDED AT REEL: 034484 FRAME: 0740. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT FOR SECURITY --- PATENTS. Assignors: CORIANT OPERATIONS, INC., TELLABS RESTON, LLC (FORMERLY KNOWN AS TELLABS RESTON, INC.), WICHORUS, LLC (FORMERLY KNOWN AS WICHORUS, INC.)
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H04B10/0795—Performance monitoring; Measurement of transmission parameters
    • H04B10/07955—Monitoring or measuring power
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0221—Power control, e.g. to keep the total optical power constant
    • H04J14/02219—Distributed control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0278—WDM optical network architectures
    • H04J14/028—WDM bus architectures

Definitions

  • the invention is in the field of Optical Telecommunications, and more particularly, pertains to correlating optical measurements in an optical network to other events occurring in the network.
  • optical measurements in an optical network are correlated to other events occurring in the optical network to localize network faults.
  • optical measurements in an optical network are compared with complex threshold functions to localize network faults.
  • baseline power measurements generated from a set of network nodes are stored, and then compared with current power measurements for the respective nodes, and if the difference between the baseline power measurement and the current power measurement is significant, a notification is generated to an operator, or the resultant problem is indicated in graphical fashion on a display.
  • alarm notifications for an optical light-path are computed based on comparing optical parameters to thresholds that vary as a function of hops from a source node to a destination node based on a power measurement point at each hop.
  • alarm notification for an optical light-path are computed based on comparing optical parameters to threshold values that vary as a function of hops from a destination node to a source node based on a power measurement point at each hop.
  • faults in an optical network are localized by comparing a pair of power measurement curves for the network as a function of time and correlating a problem in one to a change of values in the other.
  • FIG. 1 illustrates all power monitoring points along a light-path in an optical network at a fixed point in time
  • FIG. 2 illustrates the power threshold along a route of a light path in an optical network from a source node to a destination node
  • FIG. 3 illustrates optical power threshold values along a light-path route in an optical network from a destination node to a source node
  • FIG. 4 is a graph of co-location of one monitoring point with another monitoring point in an optical network
  • FIG. 5 is a graph for localizing an optical fault as a function of time
  • FIG. 6 illustrates the change in power with respect to time in an optical network
  • FIG. 7 is a block diagram of a power measuring system according to the invention.
  • FIG. 8 is a flow chart of a power measuring method for a first embodiment of the invention.
  • FIG. 9 is a flow chart of a power measuring method for a second embodiment of the invention.
  • FIG. 10 is a flow chart of a power measuring method for a third embodiment of the invention.
  • the invention is directed to methods of processing optical performance measurement in an optical network, displaying the measurements in a form that allows an operator to enter fault information related to the measurements, or to automatically generate fault alarms to the operator, based on processing of the measurements.
  • the optical measurement may be individual power measurements taken for each light-path at various points in each node it traverses, such as amplifiers, multiplexers/demultiplexers or at an interface with another node.
  • a number of methods of determining whether or not a power measurement in an optical network indicates a fault are set out below.
  • a baseline power measurement is taken (this can be done automatically or based on a user's command). All subsequent power measurements are compared to the baseline power measurements and a significant drop in power from the baseline power measurement indicates a fault.
  • FIG. 1 is directed to a power measurement technique based on a baseline power measurement taken at some historical point in the lifetime of a given light-path.
  • the baseline power measurement is initiated either automatically, as part of light-path verification, or manually by an operator.
  • the current Power Measurement (PM) values (solid line 2 ) are compared to baseline PM values (dotted line 4 ) in the graph FIG. 1 , and the suspected point of degradation is where the change from the baseline power measurement is greatest, in this instance the point 6 .
  • the power measurement points are in respective nodes in an optical network 8 , including a node 10 comprising an amplifier 12 , a multiplexer 14 and an interface device 14 , with the dotted lines 18 , 20 and 22 indicating where the respective power measurements are plotted on the graph of FIG. 1 .
  • Optical nodes 24 , 26 and 28 include similar power measurement points, with the respective measured power also being plotted on the graph.
  • Another method of determining network faults is to utilize a threshold system that takes into account the number of hops from the source of a light-path and the point within the node where the power measurement point was taken. The farther away from the source node, the greater is the dynamic range between the low and high thresholds to account for component variations.
  • This method utilizes a min/max allowable power level of a light-path at a certain monitoring point, which depends on:
  • an optical network 30 includes optical nodes 32 , 34 and 36 each including Optical Line Terminals (OLTS) connected back-to-back.
  • OLTS Optical Line Terminals
  • the graph included in FIG. 2 illustrates a region of allowable light-path power 40 centered on a nominal transmit power level 42 .
  • Dotted lines 44 , 46 and 48 show where measurement points in OLT 38 of optical node 32 are plotted on the graph of FIG. 1 . This shows positions of crossing an upper/lower power threshold, and provides a source of information of a graphical representation of where the power fault or problem occurred. It is understood that the graphical representation is information which is displayable on a display device or printable on a printer.
  • an optical network 50 includes optical nodes 52 , 54 and 56 each including OLTs 58 and 60 connected back-to-back.
  • the graph included in FIG. 3 illustrates a region of allowable light-path power 62 having an allowed power range 64 at the receiver.
  • Dotted lines 66 , 68 and 70 show where measurement points in OLT 58 of optical node 52 are plotted on the graph of FIG. 3 . This shows positions of crossing an upper/lower power threshold, and provides a source of information of a graphical representation of where the power fault or problem occurred. It is understood that the graphical representation is information which is displayable on a display device or printable on a printer.
  • the method of FIG. 3 is very similar to the method of FIG. 2 , differing only in that the number of hops is measured in the reverse direction, back from the destination node of the light-path to the source node. This allows the optical power to fluctuate as much as possible, as long as it is received in the acceptable power range of the receiver. Thus, if this method produces a threshold crossing notification, it indicates the location along a light-path where the problem occurs, whereas the method of FIG. 2 is best for warning that a card in a node doesn't meet specifications.
  • the power measurements are used as displayable information such as the following:
  • the allowed operations for the power measurements are the following:
  • a point in time March 1998 is chosen where a chosen value (CV) count spikes up as shown by a cursor 78 pointing to a source of trouble.
  • a measurement value is chosen to be displayed, such as the optical power of the appropriate or a given channel.
  • a path-driven curve of the CV at the time chosen in step 1 is generated.
  • Moving the cursor 78 in FIG. 5 will change the path-driven graph generated for an optical network.
  • the optical network 80 of FIG. 6 which includes OLTs 82 , 84 , 86 and 88 , with each OLT including an amplifier 90 , a multiplexer 92 and an interface device 94
  • moving the cursor 78 as in FIG. 5 generates power 96 at a selected time, for example March 1998, by measuring power in the respective OLTS.
  • power levels in OLT 82 are measured and displayed on the graph of FIG. 6 , as indicated by the dotted lines 98 , 100 and 102 .
  • FIG. 7 is a block diagram of a power measuring system for a given node in an optical network, which node includes an optical amplifier 102 and a multiplexer 104 connected by an optical fiber 106 .
  • An optical coupler 108 taps off on the order of 5% of the optical signal from the optical fiber line 106 and provides that signal to a power measuring circuit 110 which includes an optical-electro converter 112 which is connected to the optical coupler 108 .
  • the converter 12 converts the optical signal to an electric current.
  • the electric current from the converter 112 is provided to an A/D converter and power measurement device 114 which measures the power of the digital value of the current.
  • the measured power is then provided to a bus 116 by a line 118 for determining if the measured power is within predetermined limits, according to any of the three methods of power measuring according to the invention, which are set out below.
  • a processor 122 for processing the measured power signals from the power measuring device 110 , and corresponding power measurements from other predetermined points at other nodes in the network from other power measurement input lines 120 . Also included is a ROM 124 for storing measured power values, and a RAM 126 storing different programs for determining if power measurements at predetermined points at given nodes in an optical network are within predetermined limits. Further included is a display device 128 which displays data indicative of whether points at predetermined nodes are within acceptable power ranges. Also included is an input/output device 130 wherein an operator can input and output information to the system, and to request display of certain data on the display device 128 .
  • FIG. 8 is a flow chart for the power measuring method of the first embodiment of the invention shown in FIG. 1 .
  • the program for this power measuring method is stored in the RAM 126 ( FIG. 7 ).
  • a base line power measurement is taken at predetermined points in a set of network nodes. For example, such as the point at the output of the amplifier 102 on fiber optic line 106 as shown in FIG. 7 .
  • the base line power measurements are stored in the ROM 124 ( FIG. 7 ).
  • subsequent power measurements are taken at the same predetermined points in the set of network nodes.
  • step S 804 the stored baseline power measurements are compared with the subsequent power measurements at each of the predetermined points in the network nodes to determine if the result of comparison at any predetermined point is greater than a threshold value.
  • step S 805 an operator is notified, or points are displayed, by indicia indicating which comparison result is greater than the threshold value.
  • FIG. 9 is a flow chart of a power measuring method for the second embodiment of the invention corresponding to FIG. 2 .
  • the program for this power measuring method is stored in the RAM 126 ( FIG. 7 ).
  • data indicative of a region of min/max allowable light power for each node from a source node to a destination node is stored in the ROM 124 .
  • power measurements are taken at predetermined points in each of the nodes by hopping from the source node to the destination node.
  • step S 903 a determination is made as to whether the measured power at any predetermined point in any of the nodes from the source node to the destination is outside the region of min/max allowable light path power.
  • indicia indicative of points in each node which are outside the region of min/max allowable light power are notified to an, operator, or the points are displayed on the display device 128 .
  • FIG. 10 is a flow chart of a power measuring method for a third embodiment of the invention corresponding to FIG. 3 .
  • the program for this power measuring method is stored in the RAM 126 ( FIG. 7 ).
  • step S 1001 data indicative of a region of min/max allowable light path power for each node from a destination node to a source node is stored in the RAM 124 .
  • step S 1002 power measurements are taken at predetermined points in each of the nodes by hopping from the destination node to the source node.
  • step S 1003 a determination is made if the measured power at any predetermined point in any one of the nodes from the destination node to the source node is outside the region of min/max allocable light path power.
  • step S 1004 indicia indicative of points in each node which are outside of the region of min/max allowable light power are notified to an operator, or the points are displayed on the display 128 .

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optical Communication System (AREA)
US09/897,948 2001-01-26 2001-07-05 Processing of optical performance data in an optical wavelength division multiplexed communication system Expired - Lifetime US7231145B2 (en)

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US09/897,948 US7231145B2 (en) 2001-01-26 2001-07-05 Processing of optical performance data in an optical wavelength division multiplexed communication system
CA2435678A CA2435678C (fr) 2001-01-26 2002-01-25 Traitement de donnees de performance optique dans un systeme de communication a multiplexage par repartition en longueur d'onde optique
PCT/US2002/002117 WO2002060095A2 (fr) 2001-01-26 2002-01-25 Traitement de donnees de performance optique dans un systeme de communication a multiplexage par repartition en longueur d'onde optique
US11/747,636 US7865078B2 (en) 2001-01-26 2007-05-11 Processing of optical performance data in an optical wavelength division multiplexed communication system

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US26401601P 2001-01-26 2001-01-26
US09/897,948 US7231145B2 (en) 2001-01-26 2001-07-05 Processing of optical performance data in an optical wavelength division multiplexed communication system

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030016411A1 (en) * 2001-07-18 2003-01-23 Jingyu Zhou Method for engineering connections in a dynamically reconfigurable photonic switched network
US20060268759A1 (en) * 2005-05-06 2006-11-30 Emery Clayton J Optical line terminal that detects and identifies a rogue ONT
US20080124074A1 (en) * 2005-06-23 2008-05-29 Yu Yang Method for handling channel failures in an automatically switched optical network
US20140010529A1 (en) * 2012-07-04 2014-01-09 Ubiquoss Inc. Method for Detecting and Excluding Failed Optical Network Termination
US20170063450A1 (en) * 2015-09-01 2017-03-02 Allied Telesis Holdings Kabushiki Kaisha Optical signal monitoring

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US6721508B1 (en) 1998-12-14 2004-04-13 Tellabs Operations Inc. Optical line terminal arrangement, apparatus and methods
US7155123B2 (en) * 2002-05-10 2006-12-26 Lucent Technologies Inc. Method and apparatus for locating faults in an optical network
US7054262B2 (en) * 2004-03-26 2006-05-30 Cisco Technology, Inc. Line-level path protection in the optical layer
US20070201867A1 (en) * 2006-02-28 2007-08-30 Tellabs Petaluma, Inc. Method, apparatus, system and computer program product for identifying failing or failed optical network terminal(s) on an optical distribution network
CN101047442B (zh) * 2006-04-02 2012-05-30 华为技术有限公司 一种无源光网络的维护方法及其系统
JP5277528B2 (ja) * 2006-10-11 2013-08-28 日本電気株式会社 監視システム、光伝送装置、光伝送システム及び監視レベル設定方法
WO2009022406A1 (fr) * 2007-08-13 2009-02-19 Fujitsu Limited Station de terminal de récepteur optique, système de communication optique, et procédé de détection de coupure de signal optique
US8224180B2 (en) * 2009-10-23 2012-07-17 Fujitsu Limited Method and system for protection switching
JP5700845B2 (ja) * 2012-03-28 2015-04-15 東日本電信電話株式会社 モニタ情報処理装置、モニタ情報処理方法及びモニタ情報処理プログラム
US20190109638A1 (en) * 2017-02-02 2019-04-11 Omer F. Yilmaz Optical restoration method in optical networks controlled by a l0 sdn controller
CN109428647B (zh) * 2017-08-31 2020-04-14 华为技术有限公司 实现故障原因定位的方法、装置及存储介质

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US20030016411A1 (en) * 2001-07-18 2003-01-23 Jingyu Zhou Method for engineering connections in a dynamically reconfigurable photonic switched network
US7941047B2 (en) * 2001-07-18 2011-05-10 Alcatel-Lucent Usa Inc. Method for engineering connections in a dynamically reconfigurable photonic switched network
US20060268759A1 (en) * 2005-05-06 2006-11-30 Emery Clayton J Optical line terminal that detects and identifies a rogue ONT
US7468958B2 (en) * 2005-05-06 2008-12-23 Tellabs Petaluma, Inc. Optical line terminal that detects and identifies a rogue ONT
US20080124074A1 (en) * 2005-06-23 2008-05-29 Yu Yang Method for handling channel failures in an automatically switched optical network
US7773877B2 (en) * 2005-06-23 2010-08-10 Huawei Technologies Co., Ltd. Method for handling channel failures in an automatically switched optical network
US20140010529A1 (en) * 2012-07-04 2014-01-09 Ubiquoss Inc. Method for Detecting and Excluding Failed Optical Network Termination
US20170063450A1 (en) * 2015-09-01 2017-03-02 Allied Telesis Holdings Kabushiki Kaisha Optical signal monitoring
US9991952B2 (en) * 2015-09-01 2018-06-05 Allied Telesis Holdings Kabushiki Kaisha Optical signal monitoring

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WO2002060095A9 (fr) 2004-04-08
WO2002060095A2 (fr) 2002-08-01
WO2002060095A3 (fr) 2003-07-17
US7865078B2 (en) 2011-01-04
US20070253711A1 (en) 2007-11-01
CA2435678C (fr) 2012-02-21
CA2435678A1 (fr) 2002-08-01
US20020101631A1 (en) 2002-08-01

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